Opera 9.2 supports BitTorrent downloads. When parsing a specially crafted BitTorrent header, Opera uses memory that has already been freed. This can result in an invalid object pointer being dereferenced, and may allow for the execution of arbitrary code. The vulnerability is triggered when the user right clicks on the transfer and removes it.

Read the article HERE.

Opera v9.22 released
Fixes the issue that could occur when removing a specially prepared torrent transfer, as reported by iDefense above. For additional information on what else is upgraded visit the Changelog for Opera 9.22